单项选择题

We don’t understand the passage ___ there are a few .new words in it.

A．and
B．unless
C．because
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单项选择题
He is badly ill. We must _____ a doctor at once.
A．send to
B．send for
C．send away
单项选择题
When I came into the classroom, the teacher _____something on the blackboard.
A．is writing
B．was writing
C．wrote
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